A commonly seen artifact in PET/CT scanning is areas of “washed out” activity on the reconstructed PET scan due to arm movement after the CT scan. When a patient moves his/her arms after the CT scan, there are areas of activity outside the mask defined by the CT. This leads to an overestimation of scatter in these areas creating significant reconstruction artifacts. This case presents an example of a novel processing algorithm known as “scatter limitation” that corrects the overestimation of scatter caused by arm movement.
From the *Centre for Molecular Imaging, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia; †PET Engineering, GE Healthcare Technologies, Waukesha, WI; and ‡Departments of Medicine and Radiology, The University of Melbourne, East Melbourne, Victoria, Australia.
Received for publication September 7, 2011; revision accepted February 28, 2012.
Conflicts of interest and sources of funding: none declared.
Reprints: Jason Callahan, BAppSc (Medical Radiations), Centre for Molecular Imaging, Peter MacCallum Cancer Centre, St Andrews Pl, East Melbourne, Vic 3002, Australia. E-mail: Jason.Callahan@petermac.org.